you know about the graph of a quadratic function. 11. ... Check-In Describe the steps it takes to solve a quadratic equation by factoring. ... 9. 5 x ...
Discussion What happens if you do not remove the common factor from the coefficients before trying to factor the quadratic equation?
10. Explain how you can know there are never more than two solutions to a quadratic equation, based on what you know about the graph of a quadratic function.
11. Essential Question Check-In Describe the steps it takes to solve a quadratic equation by factoring.
Evaluate: Homework and Practice Factor the following quadratic expressions. 6x 2 + 5x + 1
Read the real-world situation and substitute in values for the projectile motion formula. Then solve the resulting quadratic equation by factoring to answer the question. 17. A golfer takes a swing from a hill twenty feet above the cup with an initial upwards velocity of 32 feet per second. How long does it take the ball to land on the ground near the cup?
18. An airplane pilot jumps out of an airplane and has an initial velocity of 60 feet per second downwards. How long does it take to fall from 1000 feet to 900 feet before the parachute opens?
A race car driving under the caution flag at 80 feet per second begins to accelerate at a constant rate after the warning flag. The distance traveled since the warning flag in feet is characterized by 30t 2 + 80t, where t is the time in seconds after the car starts accelerating again. 19. How long does it take the car to travel 30 feet after it begins accelerating?
20. How long will the car take to travel 160 feet?
Module 8
328
Lesson 2
Geometry For each rectangle with area given, determine the binomial factors that describe the dimensions. 21.
22.
area = 21x2 + 13x + 2 area = 6x2 + 17x - 3
23. Multiple Response Which of the following expressions in the list describes the complete factorization of the quadratic expression 15x 2 - 25x - 10? Circle all that apply. b. 5(3x + 1)(x - 2) c. 5(x + 2)(3x - 1) a. (3x + 1)(5x - 10) d. 5(x - 2)(3x + 1)
e. 5(3x - 1)(x + 2)
f.
(5x - 10)(3x + 1)
H.O.T. Focus on Higher Order Thinking
24. Multi-Part Response A basketball player shoots at the basket from a starting height of 6 feet and an upwards velocity of 20 feet per second. Determine how long it takes for the shot to drop through the basket, which is mounted at a height of 10 feet. a. Set up the equation for projectile motion to solve for time and convert it to standard form.
c. Explain why you got two positive solutions to the equation, and determine how you can rule one of them out to find the answer to the question. Hint: Solving the equation graphically may give you a hint.
25. Critical Thinking Find the binomial factors of 4x 2 - 25.
26. Communicate Mathematical Ideas Find all the values of b that make the expression 3x 2 + bx - 4 factorable.
